Hey Steph, I’m sorry to hear that happened to you, that would be really frustrating. I just did my own site as a test and didn’t hit that, so I think it’s something unique to your site. I did some googling and found that one cause of that kind of redirect is if your .htaccess file gets messed up, and during an update would be an ideal time for that kind of problem.
My recommendation is to download a new copy of WordPress from www.ads-software.com, open up the zip file, and in the main folder you’ll find a .htaccess file. Compare it with the one on your server and see if they’re different.
Another option is to ask your host’s support folk to do this for you. ??